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Chicago police officers make a stand at Balbo Drive and Michigan Avenue as protesters march in the South Loop on the eve of the NATO summit. Go here to see our photogallery.

Chicago police officers make a stand at Balbo Drive and Michigan Avenue as protesters march in the South Loop on the eve of the NATO summit. Go here to see our photogallery. (Nuccio DiNuzzo, Chicago Tribune)

Chicago police officers make a stand at Balbo Drive and Michigan Avenue as protesters march in the South Loop on the eve of the NATO summit. Go here to see our photogallery.